Entire Forum This board This topic Members Entire Site
 Welcome, Guest. Please login or register.Did you miss your activation email? April 23, 2018, 09:37:31 21:37 1 Hour 1 Day 1 Week 1 Month Forever Login with username, password and session length
 Pages: [1]
 Author Topic: Phase angle /P.F circuit  (Read 3720 times) 0 Members and 1 Guest are viewing this topic.
gopi_sonsivri
Newbie

Offline

Posts: 22

Thank You
-Given: 18
-Receive: 25

 « on: December 12, 2009, 09:25:03 21:25 »

Hi all,

I am designing a energy meter using PIC controller.

I first actually want to measure the phase difference(ANGLE) between voltage and current.and i wud getpower factor by sending it to adc-->PIC the doing cos(phi) in controller program for the phi being read

here is a circuit i have drawn ...is there any prob or simple way to do it

Thank u in advance

 Logged

click  thanks if you like mypost
oldvan
Senior Member

Offline

Posts: 375

Thank You
-Given: 153
-Receive: 106

If the van is a Rockin'...

 « Reply #1 on: December 13, 2009, 01:03:43 01:03 »

http://www.sonsivri.com/forum/index.php?topic=14054.0

might provide useful insights, especially the schematic:

 Logged

Give a man a fish and you feed him for a day.
Teach a man to fish and he will sit around in a boat drinking beer all day.
DTiziano
Active Member

Offline

Posts: 104

Thank You
-Given: 36
-Receive: 168

 « Reply #2 on: December 13, 2009, 04:21:23 04:21 »

Hi
To calculate the energy you need of course also the voltage and the current values.
So why do not you compute the active energy (Wh) directly from the samples values of current and voltage ?
If you sample the voltage and current some tenth time every period you can calculate the energy by integrating the V*I*dt without to detect the phase angle .

You can find additional details here:

http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2008/cj72_xg37/cj72_xg37/index.html

 Logged
gopi_sonsivri
Newbie

Offline

Posts: 22

Thank You
-Given: 18
-Receive: 25

 « Reply #3 on: December 15, 2009, 03:52:53 03:52 »

thanks but i am using different method...i use two small t/f and rectify by precision rectfier...diodes cause drop in that circuit if used directly n i need of high rating...
 Logged

click  thanks if you like mypost
 Pages: [1]
Jump to:

 DISCLAIMERWE DONT HOST ANY ILLEGAL FILES ON THE SERVERUSE CONTACT US TO REPORT ILLEGAL FILESADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS... Copyright © 2003-2999 Sonsivri.to ... | HarzeM Dilber MC